The ZL50212 Voice Echo Canceller implements a cost effective solution for telephony voice-band echo cancellation conforming to ITU-T G.168 requirements. The ZL50212 architecture contains 144 groups of two echo cancellers (ECA and ECB) which can be configured to provide two channels of 64 milliseconds or one channel of 128 milliseconds echo cancellation. This provides 288 channels of 64 milliseconds to 144 channels of 128 milliseconds echo cancellation or any combination of the two configurations. The ZL50212 supports ITU-T G.165 and G.164 tone disable requirements.